/*
 * Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
 * Distributed under the terms of the MIT License.
 *
 * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
 * Distributed under the terms of the NewOS License.
 */
#ifndef _KERNEL_ARCH_X86_32_IFRAME_H
#define _KERNEL_ARCH_X86_32_IFRAME_H


struct iframe {
        uint32 type;    // iframe type
        uint32 gs;
        uint32 fs;
        uint32 es;
        uint32 ds;
        uint32 di;
        uint32 si;
        uint32 bp;
        uint32 sp;
        uint32 bx;
        uint32 dx;
        uint32 cx;
        uint32 ax;
        uint32 orig_eax;
        uint32 orig_edx;
        uint32 vector;
        uint32 error_code;
        uint32 ip;
        uint32 cs;
        uint32 flags;

        // user_sp and user_ss are only present when the iframe is a userland
        // iframe (IFRAME_IS_USER()). A kernel iframe is shorter.
        uint32 user_sp;
        uint32 user_ss;
};

#define IFRAME_IS_USER(f)       ((f)->cs == USER_CODE_SELECTOR \
                                                                || ((f)->flags & 0x20000) != 0)


#endif  /* _KERNEL_ARCH_X86_32_IFRAME_H */